Protective stand or platform for windows



SHOZABURO OTANI 2,823,957

PROTECTIVE sum: OR PLATFORM FOR munows Feb. 18, 1958 3 Sheets-Sheet 1 Filed June ,8, 1955 SHOZABURO OTANI 2,823,957

PROTECHYE STAND 0R PLATFORM FOR WINDOWS Feb. 18, 1958 '3 Sheets-Sheet 2 Filed June 8, 1965 fpaf C m m WWW/.2 w w w FeB. 18, 195.8 SHOZABURO 0mm 2,823,957

PROTECTIVE STAND OR PLATFORM FOR WINDOWS Filed June 8,- 1955 3 Sheets-Sheet 3 United States Patent 2,823,957 PROTECTIVE STAND 0R PLATFORM FOR WINDOWS Shozaburo Otani, Chicago, Ill. Application June 8, 1955, Serial No. 514,006 4 Claims. (Cl. 304-44) The present invention relates to a novel protective stand 'or platform that is portable and adapted to be readily and securely mounted upon a window sill or the like for safely and comfortably supporting a workman in stand ing or sitting position and permitting such workman to conveniently and safely work at the exterior of the window.

Although various types of scaffolds and supports have been proposed for supporting a workman at the exterior of a, window opening, their use has been limited either because they are not capable of being securely mounted in the window opening, are not readily adjustable to anchor onto sills of varying widths or dimensions and contours, or they do not provide adequate safety to the workman and represent hazards to those below.

Tomake for a practical and universally acceptable window stand or platform, it must be capable of being readily applied and rigidly secured or anchored to the various types and contours of sills encountered in a building and without damage thereto, it must be readily and easily applied to and removed from the interior of the Window without marring the finish of the sill and adjacent surfaces, it must assure protection to those who may pass therebeneath, and it must be portable to permit an individual to quickly mount or remove it from operative position and move it to another location for use.

The present invention comprehends a novel protective stand or support so constructed and designed that it may be readily lifted by a workman and applied to the window sill from the interior without marring or damaging the sill and adjacent surfaces, is readily, easily and securely anchored in operative position by such workman from the interior and maintained against tilting while supporting such workman or window washer and can be readily and easily removed and moved to another window by such workman, and when adjusted to a particular sill contour and dimensions it can be applied to successive window sills of similar contour and dimensions without readjustment.

It is a further object of the present invention to provide a novel portable window stand or platform that is collapsible and foldable into a compact, locked assembly whereby it may be easily carried about by an individual and stored when not in use, and readily made available for subsequent use.

Another object of the present invention is to provide a novel adjustable stand or support that is readily portable and can be conveniently placed upon the top of a window sill and quickly moved or rolled into operative position over the window sill and positively anchored in such operative position. It is so simple to locate and mount upon the window sill or dismount and remove therefrom, that anyone can operate the device with little or no experience. Because it is so rigidly anchored and securely maintained in position on theisill, any workman supported thereon is given the utmost assurance that he is positively and securely supported whether in standing 2,823,957 Patented Feb. 18, 1958 or sitting position without danger to himself or those below.

The present invention further comprehends a novel means and manner of supporting the novel portable window stand or platform in a substantially horizontal plane upon a window sill with the only contact being at the inner and outer edges of the sill through a novel adjustable clamping means capable of being anchored to the interior overhang of the sill and to the outer edge of the sill.

Another object of the present invention is to provide a novel adjustable guard and platform for supporting a workman at the exterior of a window or window opening in either standing or sitting position, and when thenovel portable stand is not in use may be folded and locked in collapsed position for easy carry or for storage. When collapsed, the novel compact portable unit is so constructed at one end of the guard that it may be supported thereby in upright position with the component parts of the unit in closed position and locked together.

A further object of the present invention is the provision of a protective window stand having novel adjustable clamping means at its inner end for receiving the overhang at the interior of a window sill, such clamping means being readily adjustable to accommodate overhangs that may vary in thickness or depth.

Further objects are to provide a construction of maxi mum simplicity, efliciency, economy and ease of assembly and operation, and such further objects, advantages and capabilities as will later more fully appear and are inherently possessed thereby.

The invention further resides in the construction, combination and arrangement of parts illustrated in the accompanying drawings, and while there is shown therein a preferred embodiment, it is to be understood that the same is susceptible of modification and. change, and comprehends other details, arrangements of parts, features and constructions without departing from the spirit of the invention.

In the drawings:

Figure l is a view in side elevation of the novel safety window stand or platform assembly mounted in operative position on a window sill but with the back rest only partially extended or elevated and inclined.

Fig. 2 is a fragmentary view in front elevation of the stand or platform assembly of Fig. l, but with the back rest fully extended and locked in its elevated position.

Fig. 3 is a view in side elevation of the novel portable stand or platform assembly retracted or collapsed and folded and partly locked so that the worker can move it from one window to the other and temporarily stand it on one end while opening the window.

Fig. 4 is a view in rear elevation of the collapsed and folded, portable stand or platform assembly of Fig. 3.

Fig. 5 is a top plan view of the extended and opened, portable stand or platform assembly.

Fig. 6 is a view in vertical cross section taken in a plane represented by the line 6-6 of Fig. 5 and viewed in the direction of the arrows, but with the back rest assembly broken away.

Fig. 7 is a fragmentary enlarged plan view of one side of the adjustable carriage, and with portions thereof broken away to more clearly disclose its assembly.

Fig. 8 is a view in side elevation of the novel window stand or platform assembly and showing the mannen'o'f applying the assembly to a window sill.

Fig. 9 is a fragmentary enlarged view in side elevation of the adjustable carriage and the outer supporting frame of the portable window stand or platform assembly with the side rails of the outer supporting frame and carriage locked together as when the assembly is collapsed as in Fig. 4.

Fig. 10 is an enlarged view, part in front elevation and part in vertical cross section, through one side of the carriage and its seat and the outer supporting frame connected thereto, the section being taken on the line 10i0 of Fig. 5 and viewed in the direction of the arrows.

Fig. 11 is a fragmentary view in side elevation of the forward end of one of the side rails of the inner frame and the retracted carriage when the assembly is collapsed and showing the manner of locking these parts in inoperative position for storage or when carrying the collapsed assembly.

. Fig. 12 is a fragmentary view in vertical cross section taken on the line 1212 of Fig. 9.

Fig. 13 is a fragmentary view in vertical cross section taken on the line 1313 of Fig. 5.

. Fig. 14 is a fragmentary enlarged plan view of the crank arm and its operating handle in extended operative position and the mounting of the adjustable screw in a bearing block on the underside of the fixed transverse bar at the front of the inner frame of the protective stand.

Fig. 15 is a fragmentary enlarged view in horizontal cross section taken on the line 1515 of Fig. 2.

Fig. 16 is a fragmentary enlarged view taken on the line 1616 of Fig. 2.

Fig. 17 is a fragmentary enlarged view in vertical cross section taken on the line 1717 of Fig. 2 and viewed in the direction of the arrows.

Fig. 18 is a fragmentary enlarged view in horizontal cross section taken on the line 18-18 of Fig. 5 and viewed in the direction of the arrows.

Referring more particularly to the disclosure in the drawings and to the novel embodiment selected to illustrate the present invention, this invention comprehends a novel protective and portable stand or platform adapted to be detachably anchored onto a Window sill and made readily adjustable for mounting upon sills of various widths and conformations. Where the sills of plural windows are of similar contour and dimensions, adjusting the portable stand or platform for one window permits the operator or workman to quickly remove the stand or platform from one sill to which it has been adjusted and to mount it upon successive sills Without altering the previous adjustment.

The novel protective stand or platform may be readily collapsed or folded and locked into a compact, portable unit for storage and which unit is portable and may be readily carried about from one window to the next or from place to place. As it is applied to the sill from the interior and in the method of assembly the inner end of the stand is first anchored to the interior of the sill before the outer end thereof is moved to anchored posi tion, there is no danger of the stand or platform being projected beyond its operative position in the window opening.

The novel assembly comprises an inner frame 11 extending across the window sill 10, a carriage 12 carried by the inner frame and adjustable with respect thereto and an outer frame or support 13 for support the workman in either standing or sitting position. The inner frame 11 has side rails 14 and 14' each provided with an inturned base flange 15 and a transverse angle bar 16 on the base flanges 15 with the opposite ends of the depending flange 17 of the forward transverse bar 16 being notched to receive and the ends of the bar rigidly aflixed to the flanges 15 of the opposite side rails 14 and 14 by rivets, bolts or other suitable securing means. A transverse angle bar 18 is aflixed to and forms part of the carriage with its opposite ends slidably mounted on the flanges 15 of the side rails 14 and 14 and'its depending flange 19 slotted to receive the flanges 15 and be guided thereby. v

The depending flange 19 of the movable or slidable receive the outer end of a threaded rod or screw 21 for workman. The angle members '54 for the extensible frame 55 areretained and guided at their lower ends- 4 slidably moving this bar 18 longitudinally of the side rails 14 and 14. The inner end of this threaded rod or screw 21 is journalled in and projects through a threaded bearing block 22 rigidly secured to the depending flange 17 of the stationary or fixed transverse bar 16 and through an aligned opening in this flange.

The forward end of the threaded rod or screw 21 is bent to provide a crank arm 23 to which is connected a handle 24 by means of a sleeve or coupling 24 through a pin and slot arrangement 25, whereby when in the extended position of Figs. 1, 5, 6, 8 and 14, turning the handle moves the transverse bar 18 and carriage 12 longitudinally of the inner frame 11. In addition to the bar 18, the carriage includes spaced longitudinally extending angle members or side rails 26 and 26 to the depending flange 27 of each of which is rigidly attached at 28 a downwardly and outwardly inclined leg member 29 carrying at its lower end a stub shaft 31 carrying atits outer, offset end a rubber-covered roller 32.

These rollers 32 are adapted to roll over the sill 10 or other surface over which the portable unit may be moved into or out of operative position, or over a floor as when transporting the assembly from one position to another. Each roller 32 is preferably maintained in suitably spaced relation with its leg by a sleeve 33 encompassing its stub shaft 31, and this shaft is detachably mounted at one end in its supporting leg 29 by a nut 34. A laterally projecting pin 35 is mounted on each leg 29 in spaced relation with the shaft 31 and its sleeve 33 and provides a stop or abutment for a purpose to be later explained.

The longitudinally extending members or side rails 26 and 26 of the carriage 12 are arranged parallel to and disposed inwardly of the side rails 14 and 14 of the inner frame 11 and on each member or side rail 26 and 26 is secured an angle bracket 36 extending for a portion of the length of these side rails, and a stirrup 37 with each of these stirrups adapted to slidably receive one of the side rails 14 or 14 of the inner frame 11 for guiding longitudinal movement between the frame 11 and the carriage 12. The upstanding flange of each bracket islongitudinally slotted to receive a pin 38 projecting from the opposite sides at an end of a seat A to support a workman when seated. This seat on its upper surface iscushioned at 39 and tensionally held by a spring .clip 41. The outer supporting frame 13 comprises side rails 42 and 42, spaced transverse angle bars 43 and 44, and

intermediate transverse supporting bars 45 spaced apart of angle members 51 and 51 of a back guard or back rest assembly 52 to pivotally connect these angle members and the back guard assembly to the uprights or brackets 46, whereby the back guard assembly may be folded down upon the side rails 14 and 14 when the device is in collapsed or inoperative position. Each upright or bracket 46 is further supported by a brace bar 53 each rigidly secured at one end to the flange 47 of its upright or bracket 46 and at its other end to the upstanding fiange of its adjacent side rail 42 or 42 of the outer frame or support 13.

A complementary angle member 54 (Figs. 15 and 16) rides upon each angle member 51 and 51 to provide an extensible frame 55 for the back guard or rest assembly,

52 and whereby the latter may be readily adjusted to. any desired height .to provide maximum protection for the upon the angle members 51 and 51 by the inturned and overlapping ends 56 of a transverse bar or strap 57 bridging and carried by the lower ends of these angle members 54 of the extensible frame 55,. and by a member '58 secured to and encompassing each of the angle brackets 51 and 51 at their upper ends. A winged set screw 59 is threaded into each encompassing member 58 audits angle bracket Sl m 51 andadapt ed to engage a flange on an angle member 54 slidably mounted onthe brackets 51 and 51 for locking the extensible frame 55 in a raised or extended position.

These angle members 54 are rigidly secured together at their upper end by a bridging transverse bar 61 provided with a protective pad or cushion 62 on its inner face. The projecting upper end of each angle member 54 is notched at 63 on its intur-ned flange to receive and retain the bail or handle of a bucket or other receptacle 64 and is also notched at 65 on its other flange to interlock with a pin or catch 66 (Figs. 5, 6 and 11) at the inner, forward end of the upstanding flanges of the side rails 14 and 14 of the innerframe 11. Thus when "this back guard is collapsed or folded down with its angle members located within the confines of these side rails, these telescoping members are locked in closed assembly for storage or for facility in carrying the portable protective stand or platform.

To lock the back ,g ard 52 in its :elevated, inclined or vertically elevated, protective and operativeposition, each angle member 51 and 51a is provided on its inner flange with a depending latching member 6.7 (Figs. 2, l7 and 18) having its lower end odset at 68 and slotted .at 68.

In the event the workman wishes to be seated on the seat A while work n the back guard assembly 52 may be arranged in theinclined position of Figs. 1 and 17 in which position the lower end :of each of the offsets .68 e dep nd ng atch ng members 67 overlaps and an-. chors onto the rear fla ge of its adjacent upright or "upstanding bracket with the upper edge of the rear flange ei ed in, e slot 68. a d l cking he back u in rigid position. c

When the workman desires to work in a. standing position, he ack. uard ass mbly is le at d to t P o of 6 a d 18 in. wh ch t e o fset, o er end 68 of each f the d pehdihslatch hs mem er 6: overlaps or receives in the otIset the upper end of t lt? side flange f he up hts o up t ndin bra ets In t latter ope op r ive Po t on 15 th bac guard in vertical p ion, e lo e off e end 68s e ch atchins member is oc ed ag st o dja nt end of its adi r e r 53 he eby he e tisa y e e ated or extended back guard 52 is prevented from being tilted pi o n rdly n e s d nt the back shard i sp d and el a ed sutfic n ly o ai e the-of set nds 68 of the tch ng m mber 67 bey n the adjacent end of the ra e ba 53- Whe th s e evate the entir back u d 52 y h pi o e inw d y aho thepiu or lts 49.

To n hor and ret n t P ote tive s and or; pla orm on the l 10 thcinne o toi' a d cndot the i ner ra 11 is pr id d it a epehd ns eg 6.9 igs .1, 2i 6 t) at a h ide new wi h e h esr s l se ed a its pp end o n end o t e dep udinaflan e 17 of the fixed s rse r 1 by b lts r othe secu ng means and by a brace 70. Each leg iS fiiSSflQSfid as a forwardly o e g ch nel m mbe with the base of the em er l ngit d na ly slot d a t/ to anchor tothis leg an upper climbing member 72 of angular shape with the vertically 'disposed flange 73 adjusiably mqllllted in the slotted base of the channelled leg 69. by a bolt or other detachable securing means 74, and the .hQIiZQhtally disposed and outwardly projecting flange "75 adapted to rest on the overhang at the interior of ihesill.

Mounted below the clamping member 72 is 'a substantially Z-shaped bracket or clamping member 76 having its one leg7 7 adapted to be detachably and adjustably mounted upon its leg69 bya bolt or other securing means 74 projecting through the slot 7 1 and adjustable longitudinally of the slot. The intermediate portion 78 of this bracket or clamping member '76 is adapted to extend beneath the overhang at the interior of thesi'll whereby this overhang is loosely received between the portion 78 and the horizontally disposed fllange 75 of the upper clamping member 72 and with the portion '78 being of substantially less length than the flange 75. It will thus be seen that the clamping members or brackets 72 and 76 may be readily adjusted to accommodate sills or overhangs 79 at the interior of the sill 10 of different dimensions but where such overhangs are of substantially the same dimensions no further adjustment is required.

Each depending, channelled supporting leg 69 'is serrated at the rear at 80 and the vertically spaced clamping members or brackets 72 and 76' have their adjoining face provided with complementary serrations to cause interlocking engagement with the serrations 80 on the depending leg 69 when the bolts or securing means 74 are drawn tight. Thus the clamping members or brackets 72 and '76 are readily and longitudinally adjustable upon the supporting leg 69 and relative to each other for anchoring ionto window sills 10 having various contours and dimensions on the overhang 79 at the interior of the sill. Each of the clamping members or brackets 72 and 76 is preferably provided with a covering 81 of rubber or other resilient or yieldable material to avoid meaning of any surface with which these members or brackets may engage or be brought in contact.

To anchor the novel protective stand or platform at the exterior 82' of the sill 10, an angle bracket 83 is rigidly affixed to the base of each of the side rails 42 and 42 of the outer supporting frame 13 at the inner end of these rails. Each bracket 83 is provided with a downwardly and outwardly inclined, depending flange 84, with the inner face of each bracket 83 being provided with a covering 85 of rubber or other resilient or yieldable material to avoid marring of the contacted outer or exterior surface 82 of the sill 10.

The inclined, depending flange 84 is disposed adjacent and substantially parallel to the outwardly and downwardly inclined leg 29 carrying the roller 32 (Fig. 9). This leg projects through a slot in the base or inturned flange of each of the side rails 42 and 42 of the outer, supporting frame 13 and is guided between a bearing 86 in the form of asleeved pin projecting from the upstand-.

ing flange of these side rails, and a similar bearing 87 disposed atthe opposite end of the slot and carried by a bracket 88 secured to the base or inturned flange of each of the side rails 42 and 42*. By this construction and arrangement, the forward end of each of these side rails of the outer frame 13 is movable over and relative to the legs 29 from its upper or elevated and inoperative position shown in Figs. 3 and 9, to its lowered position shown in Fig. 8 in which the angle brackets 83 are disposed in position to engage the exterior edge 82 of the sill when the rollers 32 roll over and ofi of this edge as the protective stand or platform is being moved to and mounted in operative position. In this lowered position, the pins 35, there being one projecting from the inner face .of eachleg 29, provide a stop against which the 'side rails 42 and 42 abut in their lowermost position to prevent each angle bracket 83 from engaging the upper surface of the sill as the protective stand or platform is moved toanchored position or withdrawn therefrom.

To look the outer, supporting frame 13 to the carriage 12 and in inoperative position as shown in Figs. 3 and --9, a pi c a y mounted h m e ictiona hr mounted on each side rail 26 and 26 of the carriage 12 tl-PQY dd wi h a catch 0 ad p d to h rece ved in a notch or slot-91 on the inner end of each side rail 42 n o h u r. upporting f me hen ith the back guard assembly '52 collapsed or folded inwardlyover the carriage 12 and the inner frame 11, the lower edge of the transverse bar 57 at the lower end of this assembly 52 is moved rearwardly into interlocking engagement witha forwardly opening slot or notch 92 in the upper end of the flange 47 of the uprights 46 to retain the back guard collapsed. The notched forward end 65 of each of the angle members 54 is then locked to its pin 66 in the side rails 14 and 14 of the inner frame.

To position and anchor the novel protective stand or platform onto the window sill 10' and assuming the assembly is in the collapsed and inoperative position of Figs. 3, 4 and 9, the operator releases the latch members 89 at each side of the carriage 12 whereby to release the outer supporting frame 13. The anchoring brackets 72 and 76' are adjusted longitudinally on each leg 69 to accommodate the contour and the inner overhang of the sill. Where the sill is provided with a frame, such as for a storm window, with the frame mounted on and extending above the sill, or where the sill is provided with any obstruction thereon, it is necessary to elevate the frame 11 of the platform sufficiently above the top of the sill to clear the screw 21 for operation. In such event, both the brackets 72 and 76 are lowered and thereby raise the frame 11 and screw 21 at the inner end of the platform. The assembly is then placed on the sill in the position shown in Fig. 8 with the rollers 32 supporting the outer end of the assembly upon the sill. The handle 24 is then operated to manipulate the screw 21 to move the carriage 12 and the outer, supporting frame 13 which is connected to and longitudinally movable with the carriage through the depending legs 29, outwardly or rearwardly and longitudinally of the inner frame 11 until the rollers 32 drop over the outer edge 82 of the sill and the angle brackets 83 conformably engage and seat onto the edge 82 of the sill in the manner shown in Figs. 1 and 6, whereupon the assembly is anchored in position.

As the legs 29 on the carriage 12 are freely slidable in the side rails 42 and 42 of the outer, supporting frame 13, the angle brackets 83 and the attached outer frame 13 move to substantially the position shown in Fig. l. The angle members 54 of the extensible back guard assembly 52 are released from the pins 66 (Fig. 11) and the transverse bar or strap 57 is withdrawn from the slot or notch 92 in the uprights 46, whereupon the back guard assembly may be elevated to the position shown in Fig. 1, in which the lower, offset end 68 of the latching member 67 straddles the upper end of the flange 47 of the uprights 46. The extensible frame 55 may be elevated to its fully extended position or to any intermediate position as desired, and locked in that adjusted position by the winged set screws 59. The assembly is now located and rigidly held in operative position to safely support and protect a workman at the exterior of the window opening.

In this operative position, the inner frame 11, the carriage 12 and the outer supporting frame 13 are located and rigidly maintained in substantially horizontal position with the angle brackets 83 anchored to the exterior edge 82 of the sill 10 and the inner supporting brackets or clamping members 72 and 76 anchoring the assembly at the inner edge or overhang 79 of the sill. The Weight of the assembly, that of the workman and of his tools or equipment, and the arrangement of the legs 29 on the carriage 12 with respect to the angle brackets 83 on the outer, supporting frame 13, cause these brackets to be maintained wedged against the outer edge 82 of the sill.

The assembly may be quickly and easily removed from the sill by collapsing the back guard 52 and elevating the outer end of the assembly to dislodge the angle brackets 83. It requires no manipulation of the handle 24 and its adjusting screw 21 to remove the protective stand, and if the assembly is to be mounted or employed in another window opening having a similar sill arrangement, no further or subsequent adjustment is required after the initial adjustment has been made.

Upon removal, the component parts of the assembly may be locked by the latch member 89 which locks or latches the outer, supporting frame 13 in its elevated position to the carriage, by the spaced portions of the transverse bar or strap 57 received in the slot 92 in each of the uprights 46 and guided into said slots by 1 contact with the inclined brace bars 53, and by the pins 66 and the notch or slot 65 in the inner end of each of the angle members 54 of the extensible frame 55 which locks the back guard 52 to the side rails 14 and 14 of the inner frame 11 at its forward end. With the component parts so locked together, the collapsed assembly may be set on end as in Figs. 3 and 4 for storage or shipment, or the portable assembly may be easily carried about.

Having thus disclosed the invention, I claim:

1. A protective stand for supporting a workman at the exterior of a window opening having a sill, comprising an inner frame, a longitudinally adjustable carriage carried by the inner frame, a downwardly and outwardly projecting leg depending from each side of the carriage, an outer, supporting frame vertically adjustable on said legs and provided with clamping means adapted to engage the outer edge of the sill forwardly of said legs and held wedged by said legs in anchored position, a protective back guard adjustably carried by said outer, supporting frame upon which the workman stands, anchoring means carried by the inner end of said inner frame for anchoring the latter onto the inner end of the sill, and means on said inner frame for longitudinally adjusting said carriage, its legs and said outer, supporting frame in accordance with width of said sill.

2. A protective stand for supporting a workman at the exterior of a window opening having a sill, comprising an inner frame, a longitudinally adjustable carriage carried by the inner frame, a downwardly and outwardly projecting leg depending from each side of the carriage, an outer, supporting frame vertically adjustable on said legs and provided with clamping means adapted to engage the outer edge of the sill forwardly of said legs and held wedged by said legs in anchored position, a slotted upright rigidly affixed to the two outer corners of said outer, supporting frame, an extensible back guard having complementary angle members slidable on each other with the lower end of said members mounted in the slotted uprights for pivotal and longitudinal movement, a latching member carried on the lower end of said members for locking engagement with said uprights to retain the back guard in elevated position, anchoring means carried by the inner end of said inner frame for anchoring the latter onto the inner end of the sill, and means on said inner frame for longitudinally adjusting said carriage, its legs and said outer, supporting frame for anchoring the last mentioned frame to the outer surface of the sill.

3. A protective stand adapted to be supported and anchored upon a window sill for supporting a workman at the exterior of a window opening, comprising an inner frame including side rails and a transverse bar joining the forward end of said rails, adjustable anchoring means carried by said inner frame and including a depending leg supported from each end of said transverse bar and clamping members on each leg adjustable to accommodate the inner edge of sills of different dimensions, a carriage having spaced side rails, a transverse bar and a stirrup slidable on and adjustable relative to the side rails of the inner frame and a downwardly and outwardly inclined leg rigidly secured at its upper end to each side rail of the carriage, an outer, supporting frame including spaced side rails, transverse end bars and a pair of uprights each rigidly secured to an outer end of the side rails and the adjoining end of the outer transverse bar, and anchoring means on each side rail of the outer, supporting frame for supporting this latter frame on the exterior of the sill and retained anchored by said inclined legs on the carriage.

4. A protective stand adapted to be supported above a window sill and anchored at the front and rear of the sill for supporting a workman at the exterior of a window opening, comprising an inner frame, a carriage longitudinally adjustable on the inner frame, an outer frame for supporting the workman in standing position and connected to said carriage with said inner frame, carriage and outer frame located in a substantially horizontal plane above the window sill, a protective back guard pivotally mounted on said outer frame at the rear thereof, said back guard being foldable onto the inner frame when not in use, means for locking the upper end of the folded back guard to the inner frame, means for locking the lower end of the folded back guard to the outer frame and means for locking the outer frame onto the carriage when not in use.

References Cited in the file of this patent UNITED STATES PATENTS 534,686 Falk Feb. 26, 1895 583,894 Dearborn June 8, 1897 1,454,155 Crozier May 8, 1923 2,010,532 Boesch Aug. 6, 1935 2,059,011 Moewes Oct. 27, 1936 2,714,044 Otani July 26, 1955 FOREIGN PATENTS 10,013 Great Britain 1903 73,798 Germany Apr. 13, 1893 

